CN102223076A - Magnetic isolated feedback circuit for Buck-type DC (direct current)/DC switching power supply - Google Patents
Magnetic isolated feedback circuit for Buck-type DC (direct current)/DC switching power supply Download PDFInfo
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- CN102223076A CN102223076A CN2011101732164A CN201110173216A CN102223076A CN 102223076 A CN102223076 A CN 102223076A CN 2011101732164 A CN2011101732164 A CN 2011101732164A CN 201110173216 A CN201110173216 A CN 201110173216A CN 102223076 A CN102223076 A CN 102223076A
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Abstract
The invention relates to a magnetic isolated feedback circuit for a Buck-type DC (direct current)/DC switching power supply, comprising a diode D2, a filtering capacitor C3, a sampling resistor, an output voltage, a rectifying switching tube, a fly-wheel switching tube, an output filtering inductor L and an output filtering capacitor C2, wherein the output voltage, the rectifying switching tube, the fly-wheel switching tube, the output filtering inductor L and the output filtering capacitor C2 form a Buck circuit topology; a terminal 1 and a terminal 4 of the output filtering inductor L are corresponding terminals and a terminal 2 and a terminal 3 of the output filtering inductor L are corresponding terminals; the terminal 3 of the output filtering inductor L is connected with an anode of the diode D2; a cathode of the diode D2 is connected with one end of the filtering capacitor C3 and the other end of the filtering capacitor C3 is connected with the terminal 4 of the output filtering inductor L; and the sampling resistor is connected with the filtering capacitor C3 in parallel. The magnetic isolated feedback circuit has the beneficial effects that the circuit is simple, fewer components are used, the cost is low, and the circuit can be applied in an auxiliary power supply with the lower requirement on output voltage accuracy.
Description
Technical field
The present invention relates to magnetic isolation feedback circuit, relate in particular to the magnetic isolation feedback circuit in a kind of Buck of being applied to class DC/DC Switching Power Supply.
Background technology
At present, the isolated feedback mode of Switching Power Supply has two kinds: light-coupled isolation feedback and magnetic isolated feedback.The light-coupled isolation feedback system need utilize the linear work district of optocoupler to carry out isolated feedback, and optocoupler can drift about with temperature and time in the transfer ratio in linear work district, poor anti jamming capability.These all can have influence on the precision and the stability of isolated feedback, thereby have influence on the closed-loop control characteristic of whole power supply.Magnetic isolated feedback antijamming capability is stronger, but also exist the circuit complexity, need special integrated control chip, problems such as cost height, debugging complexity.
Summary of the invention
In order to solve the problems of the prior art, the invention provides the magnetic isolation feedback circuit in a kind of Buck of being applied to class DC/DC Switching Power Supply.
The invention provides the magnetic isolation feedback circuit in a kind of Buck of being applied to class DC/DC Switching Power Supply, comprise diode D2, filter capacitor C3, the input voltage of sampling resistor and formation Buck circuit topology, the rectifier switch pipe, the continued flow switch pipe, output inductor L, output filter capacitor C2,1 port of described output inductor L and 4 ports are end of the same name, 2 ports of described output inductor L and 3 ports are end of the same name, 3 ports of described output inductor L are connected with the anode of described diode D2, the negative electrode of described diode D2 connects the end of described filter capacitor C3, the other end of described filter capacitor C3 connects 4 ports of described output inductor L, and described sampling resistor is in parallel with described filter capacitor C3.
As a further improvement on the present invention, described sampling resistor comprises sampling resistor R1, R2, and described sampling resistor R1, R2 carry out the dividing potential drop sampling to the voltage of described filter capacitor C3 respectively, and the feedback voltage signal Vs that is got connects former limit control chip.
As a further improvement on the present invention, described output inductor L is a coupling inductance.
As a further improvement on the present invention, described filter capacitor C3 connects an end ground connection of 4 ports of described output inductor L.
The invention has the beneficial effects as follows: pass through such scheme, the output voltage signal of Switching Power Supply can be sent to former limit control chip by output inductor L coupling, thereby realization closed-loop control, circuit is simple, the components and parts consumption is few, and cost is low, and, can combine with the Buck class DC/DC switch converters that needs the magnetic isolated feedback, be applied in the not high accessory power supply of output voltage required precision.
Description of drawings
Fig. 1 is the circuit theory diagrams of the magnetic isolation feedback circuit in a kind of Buck of being applied to class of the present invention DC/DC Switching Power Supply;
Fig. 2 is the circuit theory diagrams that the present invention is applied to the magnetic isolation feedback circuit in the Buck topology DC/DC Switching Power Supply;
Fig. 3 is the circuit theory diagrams that the present invention is applied to the magnetic isolation feedback circuit in the forward topology DC/DC Switching Power Supply.
Embodiment
The present invention is further described below in conjunction with description of drawings and embodiment.
Drawing reference numeral among Fig. 1 to Fig. 3 is: input voltage 1; Rectifier switch pipe 2; Continued flow switch pipe 3.
As shown in Figure 1 to Figure 3, a kind of magnetic isolation feedback circuit that is applied in the Buck class DC/DC Switching Power Supply, comprise diode D2, filter capacitor C3, the input voltage 1 of sampling resistor and formation Buck circuit topology, rectifier switch pipe 2, continued flow switch pipe 3, output inductor L, output filter capacitor C2,1 port of described output inductor L and 4 ports are end of the same name, 2 ports of described output inductor L and 3 ports are end of the same name, 3 ports of described output inductor L are connected with the anode of described diode D2, the negative electrode of described diode D2 connects the end of described filter capacitor C3, the other end of described filter capacitor C3 connects 4 ports of described output inductor L, and described sampling resistor is in parallel with described filter capacitor C3.
As shown in Figure 1 to Figure 3, described sampling resistor comprises sampling resistor R1, R2, and described sampling resistor R1, R2 carry out the dividing potential drop sampling to the voltage of described filter capacitor C3 respectively, and the feedback voltage signal Vs that is got connects former limit control chip.
As shown in Figure 1 to Figure 3, described output inductor L is a coupling inductance.
As shown in Figure 1 to Figure 3, described filter capacitor C3 connects an end ground connection of 4 ports of described output inductor L.
As shown in Figure 1 to Figure 3, the operation principle of the magnetic isolation feedback circuit in a kind of Buck of being applied to class DC/DC Switching Power Supply provided by the invention is: when described rectifier switch pipe 2 conductings, when continued flow switch pipe 3 turn-offs, 1 port of described output inductor L is a high level, 2 ports are low level, the voltage at described output inductor L two ends is Vin-Vout, this moment, 3 ports of described output inductor L were sensed as low level, 4 ports are sensed as high level, anti-phase ending of described diode D2, described filter capacitor C3 both end voltage remains unchanged; When described rectifier switch pipe 2 turn-offs, during 3 conductings of continued flow switch pipe, 2 ports of described output inductor L are high level, 1 port is a low level, the both end voltage of described output inductor L is Vout, this moment, 3 ports of described output inductor L were sensed as high level, 4 ports are sensed as low level, described diode D2 conducting, 3 of described filter capacitor C3 both end voltage and described output inductor L, the voltage unanimity of 4 ports, the turn ratio of described output inductor L are k, and the voltage on the described filter capacitor C3 is Vout/k, described sampling resistor R1 and R2 are to the voltage dividing potential drop sampling of described filter capacitor C3, the feedback voltage signal of being got is Vs, wherein
As can be seen, feedback voltage signal Vs and output voltage V out are proportional.Feedback voltage signal Vs is as the former limit control chip of isolated feedback voltage signal connection converter, to finish the closed-loop control to output voltage.Because described output inductor exists equivalent series resistance and leakage inductance, there is conduction voltage drop in diode D2, so feedback voltage signal Vs and output voltage V out be not proportionate relationship completely, has certain error.So the present invention mainly is applicable in the not high accessory power supply of output voltage required precision.
A kind of magnetic isolation feedback circuit that is applied in the Buck class DC/DC Switching Power Supply provided by the invention, the output voltage signal of Switching Power Supply can be sent to former limit control chip by output inductor L coupling, thereby realization closed-loop control, circuit is simple, the components and parts consumption is few, and cost is low, and, can combine with the Buck class DC/DC switch converters that needs the magnetic isolated feedback, be applied in the not high accessory power supply of output voltage required precision.
A kind of magnetic isolation feedback circuit that is applied in the Buck class DC/DC Switching Power Supply provided by the invention can be applied in the multiple Buck class topology, as accompanying drawing 2 and 3.Accompanying drawing 2 is for being applied in the example in the Buck topology.Accompanying drawing 3 is for being applied in the example in the forward topology.In the Buck class topologys such as the present invention can also be applied to recommend, half-bridge, full-bridge, just do not enumerate one by one, these application all belong within the protection range of this patent herein.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1. magnetic isolation feedback circuit that is applied in the Buck class DC/DC Switching Power Supply, it is characterized in that: comprise diode D2, filter capacitor C3, the input voltage of sampling resistor and formation Buck circuit topology, the rectifier switch pipe, the continued flow switch pipe, output inductor L, output filter capacitor C2,1 port of described output inductor L and 4 ports are end of the same name, 2 ports of described output inductor L and 3 ports are end of the same name, 3 ports of described output inductor L are connected with the anode of described diode D2, the negative electrode of described diode D2 connects the end of described filter capacitor C3, the other end of described filter capacitor C3 connects 4 ports of described output inductor L, and described sampling resistor is in parallel with described filter capacitor C3.
2. according to the described magnetic isolation feedback circuit that is applied in the Buck class DC/DC Switching Power Supply of claim 1, it is characterized in that: described sampling resistor comprises sampling resistor R1, R2, described sampling resistor R1, R2 carry out the dividing potential drop sampling to the voltage of described filter capacitor C3 respectively, and the feedback voltage signal Vs that is got connects former limit control chip.
3. according to the described magnetic isolation feedback circuit that is applied in the Buck class DC/DC Switching Power Supply of claim 1, it is characterized in that: described output inductor L is a coupling inductance.
4. according to the described magnetic isolation feedback circuit that is applied in the Buck class DC/DC Switching Power Supply of claim 1, it is characterized in that: described filter capacitor C3 connects an end ground connection of 4 ports of described output inductor L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101732164A CN102223076A (en) | 2011-06-25 | 2011-06-25 | Magnetic isolated feedback circuit for Buck-type DC (direct current)/DC switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101732164A CN102223076A (en) | 2011-06-25 | 2011-06-25 | Magnetic isolated feedback circuit for Buck-type DC (direct current)/DC switching power supply |
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| CN2011101732164A Pending CN102223076A (en) | 2011-06-25 | 2011-06-25 | Magnetic isolated feedback circuit for Buck-type DC (direct current)/DC switching power supply |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078499A (en) * | 2013-01-14 | 2013-05-01 | 深圳桑达国际电子器件有限公司 | Solar energy MPPT (maximum power point tracking) controller and N-BUCK converter thereof |
| CN104300769A (en) * | 2014-10-23 | 2015-01-21 | 广东威创视讯科技股份有限公司 | Isolated type H-bridge drive device |
| CN104534758A (en) * | 2014-12-12 | 2015-04-22 | 贵州永红航空机械有限责任公司 | Refrigerating system based on push-pull converter |
| CN104617763A (en) * | 2013-11-04 | 2015-05-13 | 施耐德电器工业公司 | Power supply with long power guaranteeing time |
| CN104660040A (en) * | 2013-11-26 | 2015-05-27 | 青岛鼎信通讯股份有限公司 | Buck power supply for implementing auxiliary output through self-coupling coil |
| CN104821728A (en) * | 2014-12-13 | 2015-08-05 | 襄阳精圣科技信息咨询有限公司 | Push-pull converter for refrigerating system |
| CN105915063A (en) * | 2016-05-18 | 2016-08-31 | 南京理工大学 | Synchronous step-down topological circuit with isolated output |
| CN106712492A (en) * | 2017-01-05 | 2017-05-24 | 科蒂斯技术（苏州）有限公司 | Suspension power source based on coupled inductor |
| CN107453624A (en) * | 2017-07-26 | 2017-12-08 | 广州金升阳科技有限公司 | A kind of auxiliary power supply circuit |
| CN108270358A (en) * | 2016-12-30 | 2018-07-10 | 中国矿业大学 | A kind of dual output Buck converters with coupling inductance |
| CN110045174A (en) * | 2019-05-24 | 2019-07-23 | 南京酷科电子科技有限公司 | A kind of current sampling circuit |
| CN110045262A (en) * | 2018-01-15 | 2019-07-23 | 株式会社村田制作所 | Switch driving circuit fault detection means and method, electronic equipment |
| CN111146960A (en) * | 2020-01-19 | 2020-05-12 | 矽力杰半导体技术(杭州)有限公司 | Detection circuit and switching converter using same |
| CN113141110A (en) * | 2021-04-14 | 2021-07-20 | 杰华特微电子股份有限公司 | Switching power supply circuit |
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| US5963438A (en) * | 1998-04-13 | 1999-10-05 | Virginia Power Technologies, Inc. | Bi-directional magnetic isolator |
| CN1848640A (en) * | 2005-04-14 | 2006-10-18 | 三星Sdi株式会社 | Plasma display device, power device thereof, and driving method thereof |
| CN201435679Y (en) * | 2009-05-22 | 2010-03-31 | Bcd半导体制造有限公司 | Switched-mode power supply |
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2011
- 2011-06-25 CN CN2011101732164A patent/CN102223076A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5963438A (en) * | 1998-04-13 | 1999-10-05 | Virginia Power Technologies, Inc. | Bi-directional magnetic isolator |
| CN1848640A (en) * | 2005-04-14 | 2006-10-18 | 三星Sdi株式会社 | Plasma display device, power device thereof, and driving method thereof |
| CN201435679Y (en) * | 2009-05-22 | 2010-03-31 | Bcd半导体制造有限公司 | Switched-mode power supply |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078499B (en) * | 2013-01-14 | 2015-09-02 | 深圳桑达国际电子器件有限公司 | A kind of solar energy MPPT controller and N-BUCK converter thereof |
| CN103078499A (en) * | 2013-01-14 | 2013-05-01 | 深圳桑达国际电子器件有限公司 | Solar energy MPPT (maximum power point tracking) controller and N-BUCK converter thereof |
| CN104617763A (en) * | 2013-11-04 | 2015-05-13 | 施耐德电器工业公司 | Power supply with long power guaranteeing time |
| CN104660040A (en) * | 2013-11-26 | 2015-05-27 | 青岛鼎信通讯股份有限公司 | Buck power supply for implementing auxiliary output through self-coupling coil |
| CN104300769A (en) * | 2014-10-23 | 2015-01-21 | 广东威创视讯科技股份有限公司 | Isolated type H-bridge drive device |
| CN104534758A (en) * | 2014-12-12 | 2015-04-22 | 贵州永红航空机械有限责任公司 | Refrigerating system based on push-pull converter |
| CN104821728A (en) * | 2014-12-13 | 2015-08-05 | 襄阳精圣科技信息咨询有限公司 | Push-pull converter for refrigerating system |
| CN105915063A (en) * | 2016-05-18 | 2016-08-31 | 南京理工大学 | Synchronous step-down topological circuit with isolated output |
| CN108270358A (en) * | 2016-12-30 | 2018-07-10 | 中国矿业大学 | A kind of dual output Buck converters with coupling inductance |
| CN106712492A (en) * | 2017-01-05 | 2017-05-24 | 科蒂斯技术（苏州）有限公司 | Suspension power source based on coupled inductor |
| CN107453624A (en) * | 2017-07-26 | 2017-12-08 | 广州金升阳科技有限公司 | A kind of auxiliary power supply circuit |
| CN110045262A (en) * | 2018-01-15 | 2019-07-23 | 株式会社村田制作所 | Switch driving circuit fault detection means and method, electronic equipment |
| CN110045174A (en) * | 2019-05-24 | 2019-07-23 | 南京酷科电子科技有限公司 | A kind of current sampling circuit |
| CN111146960A (en) * | 2020-01-19 | 2020-05-12 | 矽力杰半导体技术(杭州)有限公司 | Detection circuit and switching converter using same |
| CN111146960B (en) * | 2020-01-19 | 2021-06-08 | 矽力杰半导体技术(杭州)有限公司 | Detection circuit and switching converter using same |
| CN113141110A (en) * | 2021-04-14 | 2021-07-20 | 杰华特微电子股份有限公司 | Switching power supply circuit |
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